Page 4 - 2015 Summer Gazette
P. 4
Bonus Solving Problems
in the GardenDigital Content
Vinca, Botrytis Stem Canker – Petunia, Botrytis Blight and Iron Botrytis
Sporulation, Disease Deficiency, Disease
Vinca, Botrytis Stem Canker – Sporulation, Disease
Nemesia, Powdery Mildew, Back Sedum, Powdery Mildew, Disease Botrytis can attack stem tissue and is often part of a
of Leaf, Disease complex with Rhizoctonia. Reduce incidence of Botrytis/
Basil, Downy Mildew, Disease Rhizoctonia stem canker by limiting overhead watering
Impatiens (double), Downy Mildew and avoiding extended periods of wet foliage. Above all
Close Up, Disease else, foliage should be dry going into nighttime.
Petunia, Botrytis Blight and Iron Deficiency, Disease
Botrytis can cause unsightly damage to otherwise healthy
petunia blooms. When conditions favor high humidity
and likely petal wetness, apply a preventative bloom-safe
spray, such as Affirm or Palladium (use Capsil with both).
Powdery Mildew
Nemesia, Powdery Mildew, Back of Leaf, Disease
Powdery mildew is most often found on the upper leaf
surface, but can also occur on the lower leaf surface. Be
careful about assuming sporulation on the lower leaf surface
indicates downy mildew, as products used to control downy
mildew generally do not control powdery mildew and
vice versa.
Sedum, Powdery Mildew, Disease
Symptoms of powdery mildew infection in succulents
may include brown, necrotic tissue.
Downy Mildew
Impatiens (double), Downy Mildew Close Up, Disease
Downy mildew remains a problem in Impatiens walleriana.
Apparent reductions in disease incidence are likely tied
to reduced impatiens production. Continue to limit sales
of Impatiens walleriana in areas with a history of downy
mildew and offer alternatives. If offering bedding
impatiens, verify that your supplier uses a strong
preventative program.
Basil, Downy Mildew, Disease
Be aware that downy mildew is a significant problem in
basil. All basil growers should be using an aggressive,
preventative program. Ask your supplier about the
program in place for basil.
